A consumer class action suit against 10 automakers alleges the companies have known for years about the dangers of carbon monoxide poisoning when keyless vehicles continue to run after the drivers have left the car, taking their key fobs with them, according to reports Wednesday.

The issue identified in the lawsuit is that a driver can remove the key fob from the vehicle, mistakenly leaving the car running and emitting carbon monoxide. If the garage is attached to a home, the mistake can be deadly.